Hoist for building material



Aug. 27, 1940. 0. m lsAAc HOIST FOR BUILDING MATERIAL 2 Sheets-Sheet lFiled Aug. 8, 1938 Aug-1Z7, 19 0- o. M lsAAc... 2,212,711

KOIST FOR BUILDING MATERIAL Filed Aug. 8; 1938 21Sheets-Sheet 2 G, IFIE}. E.

Patented Aug. 27, 1940 UNITED STATES PATENT OFFICE 8 Claims.

This invention comprehends the provision of a hoist for concrete andother building materials which is adapted to be erected or disposed in aconvenient location adjacent the site of a proposed building for thepurpose of conveying materials from a source, as for instance a coneretemixer, to a selected point, or points, at required elevations fordisposition on a progressing structure. a

10 I prefer to construct my improved hoist in such a manner that it maybe readily portable to and from diiferent jobs and also to and fromdlfierent positions on a particular job. .Thus, when arranged at astarting point it may be moved step by step along a wall or section of astructure for elevating and delivering materials to successivepositions.

A primary characteristic of a hoist embodying my invention consists inthe provision of a receptacle for material, commonly called a "skip orbucket which is pivotally held so as to be readily tiltable fordischarging its contents at a predetermined elevation and which isoperatively connected with a power operated winch, as by means of cablesor otherwise, and the further provision of a vertically guided membercommonly termed a dilly, which is counterbalanced or so controlled bythe winch and associated with said receptacle, that when the latter hasattained a predetermined elevation the weight of said dilly will causethe receptacle to tilt and thereby dump the contents thereof.

My improvements also include, if a portable structure is employed, achassis provided with a suitable running gear, and otherwise a suitablebase,on either of which is mounted a power operated hoist, and a toweror derrick of fixed or adjustable height for operatively supporting theskip and dilly. Preferably the derrick is hinged to the chassis so as tobe disposed longitudinally of the chassis while the hoist is being movedfrom one location to another.

Moreover my invention contemplates the advantageous use of a member(dilly) which is emploved to vertically guide the skip on the tower, asa means whereby to tilt and dump the skip, without necessitating the useof trip devices such as heretofore used and which are unreliable andaiiord a limited and a difiicult control to dump at any selectedelevation within the limits of lift of the hoist, the trip means of myinvention being readily and easily operable at will, to positively dumpthe skip at any desired elevation within the limits of travel of theskip.

I have shown a preferred form of hoist for building material in theaccompanying drawings, embodying my invention, subject however, tomodification within the scope of theappended claims, without departingfrom the spirit of my 2 1 invention. 5

Referring to the drawings:

Fig. 1 represents a perspective view of a hoist constructed inaccordance with this invention;

Fig. 2 is a schematic view showing the skip in normal position in dottedlines and in the dump- 10 ing position in. full lines, also showing avariational form of control for the dilly to be used instead of thecounterweight, parts of the mechanism being shown in elevation and otherparts F in section for clarity of illustration; 15 Fig. 3 represents afront elevation of the skip showing the manner of connecting the samewith the dilly;

Fig. 4 is a top plan view of the skip with the dilly and associatedparts shown in cross section; 20

Fig. 5 is an elevational view of the hoist as when collapsed inpreparation for transportation thereof.

One embodiment of the hoist unit hereof, as shown in the accompanyingdrawings, generally 25 comprises a vehicular base A including suitablerunning gear B, casters C and an eccentric chock or wedge device C.Supported on this base is a tower or derrick D hinged thereto as at Dand adapted to be folded, as shown in Fig. 5, to facil- 30 itatetransportation of the unit. A power oper-- ated winch E consisting ofone or more drums F and F is supported on the base and operates a skipor bucket G as by means of a cable G controlled by the drum F, while aweighted member 35 or frame H known as a dilly, is vertically slidablysupported upon the tower or derrick D and provided with an outwardlyprojecting trunnion H' for effecting the tilting of the skip. A chute Jsupported on the tower receives material dumped from the skip. G, and ameans such as the counterweight K provides for control of the dilly B.

so that the dead weight thereof may be'eiiective at predeterminedelevations of the skip to cause the latter to tilt, whereby to dump theskip ccn- 45 tents into the chute J.

The elements and devices above referred to, are arranged so as toprovide a compact hoist unit which, when collapsedand arranged as shownin Fig. 5, may be readily moved from one location 50 to another and whenset up, as shown in Fig; 1, may be readily moved about in small compassfor delivering the building material to the desired places in connectionwith the structure being erected. g5

the means for vertically guiding the ship or in other words, the dillyfor the purpose of tilt the skip, it hecomee unnecessary to em ploytrips or other devices which prove umeli able of operation and limitedas to control, for dumping the ship, and a more msitive and reliable ordumping action is provided for under control such that the trip may betilted and dumped at any desired elevation over a wide range within thelimits of the tower. The counterweight K prevents the weight of thedilly from being efiective thru the trunnion H to cause the sp to tiltuntil such time as the skip reaches a predetermined elevation [orbetter, until such time that the counterweight comes to rest and is nolonger efiective. When the weight K comes to rest, the dead weight ofthe dilly H :wmes efiectlve thru the trunnion H to overbalance theforward end of the skip as the lifting action continues, but instead ofbeing lifted bodily, the skip will at this time pivot on its maintrunnions and thereby dump the material therefrom.

Referring now more specifically to the invention, it is seen that thevehicular base A, which may be of any suitable construction, is, as hereshown, constructed as a somewhat flat body having a. loading platform Iat one end and the tower or derrick D at its other end, the skipnormally resting on the frame members 2 at a point between the tower andthe loading platform. Any suitable means such as a withdrawable bolt 3may be employed for locking the tower in upright position. I

The running gear B, as here shown, consists of suitable wheels 4 mountedupon an axle 5, al-

though multiple wheels and axles may be used if desired. Any suitablemeans, not shown,'may be employed for mounting the base A in overorunder-slung relation to the axle 5. The base A is preferablyunder-slung, as shown in Fig. 1, when the hoist is set up for operation,as this will dispose the caster C in contact with the ground when theeccentric chock or wedge member C may then be manipulated, as shown inFig. 1, whereupon the structure is rigidly supported and thus heldagainst accidental movement. When it is desired to shift the hoist todifferent positions as alongside a wall or to turn a corner, theeccentric chock C is manipulated so that the base A may be turned orswung on the wheels 4. This provides for turning the hoist in a small aradius.

However, as shown in Fig. 5, when it is desired to transport the unitfrom one building site to anothen'the axle 5 of the running gear issecured under the base A and this raises the base so that the caster C,eccentric. chock C and other structures will clear the ground and permitthe towing of the unit as by a draw bar or other suitable means, notshown.

The derrick D may be of any suitable construction of fixed height oradjustable as is in any manner well known in the art, and preferably isarranged so that the power winch E is mounted within the base thereofwhereby the skip cable G may extend vertically upward from the drum Fover a pulley 6 at the top of the tower, then laterally over a pulley 1carried by a lateral extension 8 of the tower and finally downward sothat a hook 9 on the lower end thereof may be engaged in the eye III ofthe bail II. This bail i r n; 9 i/ a at is connected trlannions ii tothe ship or hucket lit at a point somewhat forwardly of the center ofweight of the bucket so that the latter tends to tilt hackwardly.However, the slip or bucket is limited as to tilting rearwardly, bymeans of stop members it and it on the bail and dilly Pl respectively.

Toe dilly it may he of any suitable construction provided it serves thepurpose of vertically guiding the skip and acts when the dead weightthereof is applied to the skip to cause the forward end of the skip totilt downward for dumping the contents thereof. As here shown, thismeans or dilly takesthe form of a substantially rectangular frame ithaving on each side opposed shoes iii slidably engaged with verticalguide members it on the tower D. The trunnion H extends outwardly fromthe lower end of this frame and passes thru openings in the outer endsof plates it fixed in any suitable manner to opposite sides of the skip.This provides a fulcrum point for the skip located below the dischargemouth of the skip and spaced somewhat inwardly of said mouth, wherebywhen the skip is rocked on said fulcrum point the discharge mouth willdescribe an arc and extend forwardly over the chute J. By thisarrangement the skip is in 'efiect pivoted on the dilly, or in otherwords, the dilly'and skip are pivotally connected.

Means is provided for raising the dilly with the skip and for preventingthe weight of the dilly from being effective to tilt the skip during thelifting of the latter to the predetermined elevation, at which thedumping is to take place. As here shown, this means may include thecounterweight K arranged to slide in a vertical guideway l9 supported bythe tower, and a cable 20' extending from said weight over a pulley 2|supported at the top of the tower and thence downwardly to a point whereconnected as at 22, with the dilly. Preferably the weight K is heavierthan the dilly so that while the weight is suspended, the weight of thedilly will not be effective to tilt the skip. However, when the weight Kcomes to rest, as for example, against a vertically adjustable pinorstop member 23 in the guideway ii, the dead weight of the dilly thenbecomes effective thru its trunnion H on the forward end of the skip sothat the pull on the cable G causes the skip to turn on the fulcrum Hand thereby dump the contents thereof, as for example, into the chute J.The pin 23 is adapted to be mounted in any one of a series of openings24 provided in the guideway so that the weight will strike the pin atdifferent elevations, where upon the skip may be operated to dump at thecorrespondingly different elevations.

Instead of using the counterweight K and its associated elements forraising the dilly and restraining the tilting action thereof during theelevation of the skip to the desired level for dumping, I may employ thepower operated winch, particularly the drum F thereof. Any suitablemeans such as the tackle designated J 'may be employed for lifting andlowering the chute to the desired elevation, there being a chutesupporting bar 25 which may be secured as by any suitable means notshown, in different positions upon the tower.

When the cable G is slacked the combined weight of the skip and dillybeing greater than that of the weight K will raise the weight K as theskip and dilly descend to the base A, whereby the hoist is ready foranother material elevating operation.

I claim:

1. In a hoist, a tower, a skip for elevating and dumping material, askip guiding and control member vertically slidably mounted upon thetower, a fulcrum member fixed to said guide and control member andpivotally connecting said skip with said control member, meansassociated with the tower for lifting and lowering said skip, and meansoperable for stationarily suspending said control member while thelifting of the skip continues, whereby the skip will tilt on saidfulcrum member into dumping position, said means including a weightmember, a guideway therefor on said tower, a pulley supported by thetower, a cable extending over said pulley and connected at its end withsaid guide and control member and said weight respectively, and a stopmember against which said weight comes to rest to stop the elevation ofthe guide and control member.

2. In a hoist, a tower, a skip for elevating and dumping material, askip guiding and control,

member vertically slidably mounted upon the tower, a fulcrum memberfixed to said guide and control member and pivotally connecting saidskip with said control member, means associated with the tower forlifting and lowering said skip, and means operable for stationarilysuspending said control member while the lifting of the skip continues,whereby the skip will tilt on said fulcrum member into dumping position,said means including a weight member, a guideway therefor on said tower,a pulley supported by the v tower, a cable extending over said pulleyand connected at its end with said guide and control member and saidweight respectively, and a vertically adjusted stop member against whichsaid weight comes to rest to stop the elevation of the guide and controlmember.

3. In a hoist, a tower, a skip guiding and dumping member verticallyslidably mounted on said tower, a skip fulcrumed adjacent its dumpingend upon said member and adapted for simultaneous vertical movementtherewith and for tilting movement relative thereto, a bail pivoted onsaid skip between its ends, a hoisting cable connected with said bailand the tower for simultaneously raising and lowering the skip and saidmember, stop members carried by said bail and said dumping member forlimiting movement of the skip in one direction and means op erating tocounterbalance the weight of said dumping member during the lifting ofthe skip and said member to a predetermined elevation, then applying theweight of said member to overbalance and tilt said skip to a dumpingposition while the lifting force is applied to the s m.

4. In a hoist, a tower, a skip controlling member movable up and down onsaid tower, a skip fulcrumed adjacent one end on said member formovement into and out of dumping position, a single cable connected withsaid tower and said skip for hoisting said skip and said member and fortilting said skip, and means including a cable connected with said towerand said member and operable for relieving the weight of said memberduring the hoisting of said skip and member by said single cable to apredetermined elevation and then applying the dead weight of said memherto said skip through said fulcrum whereby a hoisting force then appliedto the skip through said single cable will tilt the skip on said fulcruminto dumping position.

5. In a hoist, a tower, a skip for elevating and dumping material, askip guiding and control member vertically s'lidably mounted upon thetower, means for fulcruming said skip on said control member formovement into and out of dumping position, a single cable associatedwith the tower and connected with the skip for lifting and lowering theskip and said member, and means including a cable operable forstationarily suspending said control member when the skip and saidmember have been lifted to a predetermined elevation whereby upon thefurther lifting of the skip through said first-named cable the deadweight of the control member is applied to and causes the skip to tilt,said lastnamed means including a Weight member connected with the cablethereof and stop means against which the weight is adapted to rest forstationarily suspending said control member so that the dead weightthereof will be effective for causing a tilting of the skip.

6. In a hoist, a tower, a skip controlling member movable on said tower,a skip fulcrumed adjacent one end to a marginal portion of said memberfor tilting movement to dispose the discharge end thereof exteriorly ofthe tower, a hoist cable associated with the tower and connected withsaid skip for lifting and lowering the skip and cable, means connectedwith the tower and member for relieving the weight of said member duringthe hoisting of the skip to a predetermined elevation and thenautomatically suspending the skip stationarily so that the dead weightthereof is borne by the fulcrum connection with the skip whereby furtherlifting of the skip will cause the same to tilt as aforesaid on itsfulcrum.

7. In a hoist, a tower, a skip controlling member movable vertically onthe tower, a fulcrum member extending outwardly from a point adjacent alower corner of said member, a skip fulcrumed adjacent one end of saidfulcrum member, a hoisting cable carried by the tower and connected withsaid skip at a point between the ends of the latter for raising andlowering the skip and control member simultaneously, and means includinga cable connected with the tower and control member for assisting in thelifting of the latter while the skip is being raised to a predeterminedposition and then automatically applying the dead weight of the controlmember to the skip through said fulcrum member for tilting the skip intodumping position.

8. In a hoist, a tower, a skip mounted thereon for elevating and dumpingmaterial, a weight member associated with the skip and tower formovement with the skip thereon and means controlling said weight memberfor automatically relieving the weight thereof during the hoisting ofthe skip to a predetermined elevation and then applying the dead weightof said weight memher to said skip for effecting the tilting and dumpingof the skip.

DONALD MACISAAC.

